中国南方乡村黑碳稳定同位素特征及来源解析——以江西于都为例  

Source apportionment of black carbon stable isotope in a village of southern China——Take Yudu Jiangxi Province as example

作　　者：黄莉磊 肖红伟 毛东阳[1,4] 曾梓琪 伍作亭 朱仁果 HUANG Li-lei;XIAO Hong-wei;MAO Dong-yang;ZENG Zi-qi;WU Zuo-ting;ZHU Ren-guo(Jiangxi Province Key Laboratory of the Causes and Control of Atmospheric Pollution,Nanchang 330013,China;School of Water Resources and Environmental Engineering,East China University of Technology,Nanchang 330013,China;Rosenstiel School of Marine and Atmospheric Science,University of Miami,FL,33149,USA;School of Geosciences,East China University of Technology,Nanchang 330013,China)

机构地区：[1]江西省大气污染成因与控制重点实验室,江西南昌330013 [2]东华理工大学水资源与环境工程学院,江西南昌330013 [3]迈阿密大学罗森斯蒂尔海洋与大气科学学院,美国佛罗里达州33149 [4]东华理工大学地球科学学院,江西南昌330013

出　　处：《中国环境科学》2021年第2期566-573,共8页China Environmental Science

基　　金：国家自然科学基金资助项目(42063001,41663003)。

摘　　要：于2018年冬季(1月)和夏季(7月)在中国南方江西于都某偏远乡村采集PM_(2.5)样品,分析PM_(2.5)中BC浓度及其稳定碳同位素(δ^(13)CBC),水溶性离子浓度.结果表明,采样期间BC在冬季和夏季平均浓度分别为(1.3±0.8),(0.8±0.3)μg/m^(3),δ^(13)CBC在冬季和夏季平均值分别为(-25.8±1.6)‰和(-26.3±0.7)‰,两者整体呈现冬季高夏季低趋势,可能受到不同来源影响.相关性分析和贝叶斯模型源解析结果表明:冬季受生物质燃烧贡献最大为44.3%,其次机动车尾气和煤燃烧,分别为29.3%和26.4%;夏季受机动车尾气贡献最大为58.5%,其次生物质燃烧和煤燃烧,分别为28.8%和12.7%.后向轨迹表明,中国南方乡村的BC可能受到城市污染区域的长距离输送影响.In this study,PM_(2.5) samples were collected in winter(January)and summer(July)2018 at a remote site over the southern China.Black carbon(BC)concentrations of PM_(2.5) and their stable carbon isotope(δ^(13)CBC)values,as well as water-soluble ion concentrations were analyzed.The results showed that the average concentrations of BC were(1.3±0.8)μg/mm^(3)and(0.8±0.3)μg/m^(3),while the average values of δ^(13)CBC were(-25.8±1.6)‰and(-26.3±0.7)‰in winter and summer respectively.Both BC concentrations andδ13CBC showed high in winter and low in summer,suggesting that BC may be affected by different sources in different season.The results of Bayesian model showed that the fractional contributions of BC were 44.3%(28.8%)from biomass combustion,29.3%(58.5%)from motor vehicle exhaust and 26.4%(12.7%)from coal combustion in winter(summer).The backward trajectories indicated that the BC in the background area of southern China may be affected by the long-distance transport from urban polluted areas.

关 键 词：PM_(2.5) 黑碳 稳定碳同位素 生物质燃烧 nss-K^(+)/BC 

分 类 号：X513[环境科学与工程—环境工程]